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Tb 302 rpm

I have had my TB302 for several years and it runs and welds great but after reading several post on here I bought a multimeter with a Hz. scale on it and thought I would check the RPM by the Hz as recommended on here.

When I plug it in to the outlets on the welder it jumps around so much you can't tell what it's reading. When I plug it into an outlet in the shop it shows a steady 59.9.

What am I doing wrong?

Guess I wont worry to much about as it runs and welds great as is, but just curious.

Ok guys any recommendations on brand or dealer to locate the meter that has the "smoothing" feature? I've spent a couple of hours on the web looking at meters and none of them have that feature described in the specifications?